Service manual

ENGINE DISASSEMBLY
REMOVING THE TIMING GEAR CASE
REAR OIL
SEAL
b. Remove the wrist pin snap rings.
c.
Using a nylon drift, drive the wrist pin from the piston
and rod.
d. Protecting your eyes with safety glasses, disengage
and withdraw the snap rings. Although mechanics
generally press out (and sometimes hammer out)
pistons pins, these practices should
be discouraged.
Instead, take the time to heat the pistons, either with a
heat gun or on a hot plate. Pins will almost fallout.
e. While the piston
is still warm, check for bore integrity .
. Insert the pin from each side. If the pin binds at the
center, the bore might be tapered;
if the bore is
misaligned, the pin will click or bind as it enters the
far boss.
NOTE: The number stamped on the rod shank and cap
should correspond to the cylinder number. Sometimes
these numbers are scrambled or missing, and the
mechanic must supply them. Stamp the correct num-
berson the pads provided and, to prevent confusion,
deface the originals.
PISTON RING
~ ~~' /~
""'-~"'-" ~ ~ MAl:
CRANKSHAFT
PULL.EY
(\~ BEARING
CRANKSHAFT GEAR ~\J~ ~CAPS
SPRING ~~~~
WASHER ~~ ~
SLiNGE. @. ~ ~
~ ~ MAIN BEARINGS
36. Remove the rear oil seal by striking out the old seal
with a suitable mandrel.
37.
Disassemble the connecting rod caps and line up the
main bearing caps and bearings according to the order
of
bearing numbers. Also properly arrange the thrust wash-
ers, taking care not to change the combination.
38. Remove the piston and connecting rod assemblies.
Temporarily install the connecting rod cap on the con-
necting rod so as to not mix the rods and caps.
39. Disassemble the piston assembly.
a. Using the piston ring remover, remove the piston rings.
While removing the piston rings, note the order they are
removed and which side
of the ring faces the piston
crown.
40. Remove the main bearing caps.
41. Remove the main bearings and thrust bearings.
42. Remove the crankshaft.
43. Remove the tappets.
NOTE: After removing the main bearings and bearing caps
arrange them in order of removal. Do not mix caps. After
removing the thrust bearings, note their positioning for
proper
reinstallation.
Engines & Generators
13